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Wiper On and Headlights

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=61356
Printed Date: May 12, 2024 at 9:36 PM


Topic: Wiper On and Headlights

Posted By: bshow
Subject: Wiper On and Headlights
Date Posted: August 15, 2005 at 1:08 PM

CA has a new law that requires the headlights to be on anytime the windshield wipers are on (basically). I would like to have the headlights come on automatically when I turn on the wipers. I have figured out a way to do this using 4 spst relays. Three relays would switch 12 volts to a fourth relay which would turn on the low beam lights. These three relays can be low current capicity since they will only be driving the coil of the headlight relay. The coils of the 3 relays would be energized by supplying 12 volts through the high speed wiper switch, 12 volts through the low speed wiper switch, and ground through the intermittent wiper switch. My question is: Can anyone recommend something for a cleaner install than using the 3 low current relays? I will use a Bosch type 40 amp relay for the headlights.




Replies:

Posted By: firstclassohio
Date Posted: August 16, 2005 at 12:08 PM

wiper switch to 85 on relay

30 to low beam

87 to fused 12 volts or ground depending on low beam voltage you need the same

86 to ground or 12 volts depending on wiper voltage you need opposite



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